Whole house filtration is a water filtration system that is installed at the point where water enters a house, the main water supply, and its primary purpose is to improve the quality of water throughout the entire home by removing impurities and contaminants.Whole house filtration is a water filtration system that is installed at the point where water enters a house, the main water supply, and its primary purpose is to improve the quality of water throughout the entire home by removing impurities and contaminants.Whole house filtration is a water filtration system that is installed at the point where water enters a house, the main water supply, and its primary purpose is to improve the quality of water throughout the entire home by removing impurities and contaminants.